vs
Battery Energizer or Deka
You can get an Deka AUX18L from batterymart.com for $159 shipped to your door. Deka is the OE manufacturer of the BMW battery for the i3. My original battery lasted 7 years, it’s a no-brainer.
Pros: lasted 7 years
Vehicle:
BMW
Part number: AUX18L
I use Deka sealed batteries so less offgassing messing up terminals.
Pros: less offgassing
Cons: messing up terminals
I only use deka on my service rig. Usa made quality. Though listed at 540 CCA, MY Midtronics tester shows they output 650 - 750 CCA.. I easily get 7 years use in the field with these.
Pros: USA made quality, high CCA output, long lifespan
Deka batteries. I’ve turned wrenches for twenty years and they’re the only ones that still consistently test far above their rated capacity when new. I have one that’s 7 years old and just installed one in my other rig last year.
Pros: above rated capacity, long lifespan
I put a Japan made energizer 2300mh storage at least for 8 monts, charged before storage and surprise, they make my flash work very quick even at maximum power, recycling flash time is even better than manufacturer specs.
Pros: quick flash, better specs
Cons: weak chinese made
UPdate - new battery and bluetooth 12v monitor installed last Monday night, all good since then including one day with 40 miles of driving and recharging in weather well below freezing (16 to 28 F), but I happen to be mostly driving other cars the rest of the time since.
FYI, altho I ordered from Remy, the sticker on the battery I received says [Deka Intimidator EHP](https://remybattery.com/batteries/brand/deka-intimidator-batteries.html?srsltid=AfmBOorxsFi7eoMbizQPDMsF1q-32WuvMxLPyiLSgftX8ExWmqHWSfq4). IDK if there's any functional difference - it seems to have the exact same terminal connections as the OEM BMW battery it replaced.
Also FWIW, despite no indicator on the shipping box for 'this side up' and it clearly getting Ace-Ventura'd around by FedEx, it did not leak or show any signs of damage inside the shipping box. It was well padded with foam made to fit the battery and fill the entire shipping box. So far I'm happy and the car seems to be too.
Pros: happy with new battery
Vehicle:
BMW
OEM for Harley. I've replaced several with an average lifespan of 5 yrs at 20%+ cheaper than Harley branded
Pros: long lifespan, cheaper
As a harley tech I see more aftermarket batteries fail then I see oem ones fail. There are a few good aftermarkets like DEKA but for the most part aftermarket batteries seem to fail quicker then oem.
Pros: OEM batteries more reliable
Cons: aftermarket batteries fail quicker
I had same issue with energizer batteries both lasted exactly 14 months. Luckily battery came with18 months warranty so in total they lasted 28 months.
Pros: 18 months warranty
Cons: lasted only 14 months
Energizer is a shit battery. I had to put an Energizer one out of no options and that barely lasted a year.
Cons: barely lasted a year
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Which battery to choose — Energizer or Deka?
If choosing battery across many manufacturers, check the part ranking. If your choice is down to two brands, the PartReview part comparisons help.
We compare battery across these categories:
- PR Score.
- Overall ranking.
- Vote balance.
- Average rating.
- Number of reviews.
- Feature ratings.
- Car owners’ choice.
Which battery are better — Deka or Energizer?
In March 2026 on PartReview, battery Deka were overall better than Energizer.
- Energizer received a PR Score of 75 out of 100, and Deka scored 94 points.
- Energizer ranked 14 in the overall ranking, and Deka ranked 3.
- The average rating is higher for Deka (4.4) than for Energizer (3.6).
-
Battery Deka have better feature ratings than Energizer:
- Lights - owners believe, that this property for Energizer is better than Deka.
- Cranking - drivers claim, that this property for Deka is outperforms Energizer.
- Indicator - reviews suggest, that this property for Deka is preferred to Energizer.
Which battery are more popular — Energizer or Deka?
In March 2026 on PartReview, battery Deka were overall more popular than Energizer.
By vote balance, battery Deka surpassed Energizer:
- For Energizer, the ratio of positive (58) to negative (19) votes is 39 votes.
- For Deka, the ratio of positive (143) to negative (8) votes is 135 votes.
By number of reviews, battery Deka surpassed Energizer:
- For battery Energizer there are 25 reviews: 18 positive, 2 neutral, 5 negative.
- For battery Deka there are 50 reviews: 47 positive, 1 neutral, 2 negative.
Which battery do car owners prefer — Energizer or Deka?
In March 2026, according to PartReview, battery Energizer and Deka have not taken top places in car-specific ratings. You can help by adding your review about these manufacturers.
Other comparisons of battery
If this comparison didn’t fully answer your question, there are many others on PartReview.
For example, comparisons of battery Energizer with: OPTIMA, Varta, Bosch, OEM Subaru, OEM Volkswagen, YUASA, Tesla, Duralast, Exide, OEM BMW.
Also available: comparisons of battery Deka with: OPTIMA, Varta, Bosch, OEM Subaru, OEM Volkswagen, YUASA, Tesla, Duralast, Exide, OEM BMW.
You can also see who is better among other battery manufacturers: OPTIMA or Varta, OPTIMA or Bosch, OPTIMA or OEM Subaru, OPTIMA or OEM Volkswagen, OPTIMA or YUASA.